Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override

[Ingo Molnar <mingo@elte.hu>]

* Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:

> > ok. Like the patch below?
> 
> Not quite - you still need the loop in case you NMI and then run off 
> into oblivion

yes indeed. Updated patch below.

	Ingo

-------------->
Subject: x86: hlt on early crash
From: Ingo Molnar <mingo@elte.hu>

H. Peter Anvin <hpa@zytor.com> wrote:

> It probably should actually HLT, to avoid sucking power, and stressing
> the thermal system.  We're dead at this point, and the early 486's
> which had problems with HLT will lock up - we don't care.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 arch/x86/boot/compressed/misc_32.c |    3 ++-
 arch/x86/boot/compressed/misc_64.c |    3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

Index: linux-x86.q/arch/x86/boot/compressed/misc_32.c
===================================================================
--- linux-x86.q.orig/arch/x86/boot/compressed/misc_32.c
+++ linux-x86.q/arch/x86/boot/compressed/misc_32.c
@@ -339,7 +339,8 @@ static void error(char *x)
 	putstr(x);
 	putstr("\n\n -- System halted");
 
-	while(1);	/* Halt */
+	while (1)
+		asm("hlt");
 }
 
 asmlinkage void decompress_kernel(void *rmode, unsigned long end,
Index: linux-x86.q/arch/x86/boot/compressed/misc_64.c
===================================================================
--- linux-x86.q.orig/arch/x86/boot/compressed/misc_64.c
+++ linux-x86.q/arch/x86/boot/compressed/misc_64.c
@@ -338,7 +338,8 @@ static void error(char *x)
 	putstr(x);
 	putstr("\n\n -- System halted");
 
-	while(1);	/* Halt */
+	while (1)
+		asm("hlt");
 }
 
 asmlinkage void decompress_kernel(void *rmode, unsigned long heap,

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